John Rawls's Primary Goods:Problems and Revisions

In John Rawls's justification of principles of justice,the idea of primary goods plays a very important role:on one hand,it provides criterion for identifying the least advantaged;on other hand,it provides motive for persons in original position to act.Firstly,the paper briefly explicates primary goods;secondly,it deeper analyses problems in idea of primary goods;finally,it discusses John Rawls's some revisions of primary goods over time.